Hello and welcome!
You will get 1 pc of the single zone force sensing resistor.  These are used human to machine interface systems, Industrial applications, product development where a force touch control and especially for Robotic application.  The device changes resistance with force applied.

From the Data Sheet:
Interlink Electronics FSR® 400 Series is part of the single zone Force Sensing Resistor® family. Force Sensing Resistors, or FSR's, are robust polymer thick film (PTF) devices that exhibit a decrease in resistance with increase in force applied to the surface of the sensor. This force sensitivity is optimized for use in human machine interface devices including automotive electronics, medical systems, industrial controls and robotics.

Details:
  • Actuation force as low as 0.2N and sensitivity range to 20N 
  • Cost effective 
  • Ultra thin 
  • Robust; up to 10M actuations 
  • Simple and easy to integrate
  • size is 5mm effective circle x 38mm
  • Standing load durability 2.5kg for 24hrs
  • Test Durability:
  • Tested to 10 Million actuations, 1Kg 4Hz -10% average resistance change
  • Force Sensitivity Range is 0.2N - 20N
  • Force Resolution is Continuous (analog)
  • Non-Actuated or Static Resistance > 10 Meg
  • Device Rise Time is < 3 Microseconds
  • Connector type is Solder Tabs
  • RoHS Compliant